Risposte:
Ho creato una piccola applicazione con una descrizione dettagliata per ottenere le coordinate GPS della posizione corrente.
Il codice sorgente di esempio completo si trova in Ottieni coordinate posizione corrente, Nome città - in Android .
Vedere come funziona:
Tutto quello che dobbiamo fare è aggiungere questa autorizzazione nel file manifest:
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
E crea un'istanza LocationManager come questa:
LocationManager locationManager = (LocationManager)
getSystemService(Context.LOCATION_SERVICE);
Controlla se il GPS è abilitato o meno.
Quindi implementa LocationListener e ottieni le coordinate:
LocationListener locationListener = new MyLocationListener();
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER, 5000, 10, locationListener);
Ecco il codice di esempio per farlo
/*---------- Listener class to get coordinates ------------- */
private class MyLocationListener implements LocationListener {
@Override
public void onLocationChanged(Location loc) {
editLocation.setText("");
pb.setVisibility(View.INVISIBLE);
Toast.makeText(
getBaseContext(),
"Location changed: Lat: " + loc.getLatitude() + " Lng: "
+ loc.getLongitude(), Toast.LENGTH_SHORT).show();
String longitude = "Longitude: " + loc.getLongitude();
Log.v(TAG, longitude);
String latitude = "Latitude: " + loc.getLatitude();
Log.v(TAG, latitude);
/*------- To get city name from coordinates -------- */
String cityName = null;
Geocoder gcd = new Geocoder(getBaseContext(), Locale.getDefault());
List<Address> addresses;
try {
addresses = gcd.getFromLocation(loc.getLatitude(),
loc.getLongitude(), 1);
if (addresses.size() > 0) {
System.out.println(addresses.get(0).getLocality());
cityName = addresses.get(0).getLocality();
}
}
catch (IOException e) {
e.printStackTrace();
}
String s = longitude + "\n" + latitude + "\n\nMy Current City is: "
+ cityName;
editLocation.setText(s);
}
@Override
public void onProviderDisabled(String provider) {}
@Override
public void onProviderEnabled(String provider) {}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {}
}
adresses
riga che inizia con cityName =
fallirà con un'eccezione. L'uso delle parentesi graffe lo risolverebbe.
getLastKnownLocation()
è un luogo più "stantio" - perché? La chiamata getLastKnownLocation()
non riceve l'ultima lettura GPS del GPS del telefono?
Ecco ulteriori informazioni per altre risposte.
Dal momento che Android ha
GPS_PROVIDER and NETWORK_PROVIDER
puoi registrarti ad entrambi e iniziare a recuperare eventi onLocationChanged(Location location)
da due contemporaneamente. Fin qui tutto bene. Ora la domanda abbiamo bisogno di due risultati o dovremmo prendere il meglio. Come so i GPS_PROVIDER
risultati hanno una precisione maggiore rispetto a NETWORK_PROVIDER
.
Definiamo il Location
campo:
private Location currentBestLocation = null;
Prima di iniziare l'ascolto sul cambio di posizione implementeremo il seguente metodo. Questo metodo restituisce l'ultima posizione nota, tra il GPS e quella di rete. Per questo metodo il più nuovo è il migliore.
/**
* @return the last know best location
*/
private Location getLastBestLocation() {
Location locationGPS = mLocationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
Location locationNet = mLocationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
long GPSLocationTime = 0;
if (null != locationGPS) { GPSLocationTime = locationGPS.getTime(); }
long NetLocationTime = 0;
if (null != locationNet) {
NetLocationTime = locationNet.getTime();
}
if ( 0 < GPSLocationTime - NetLocationTime ) {
return locationGPS;
}
else {
return locationNet;
}
}
Ogni volta che recupereremo una nuova posizione, la confronteremo con il nostro risultato precedente.
...
static final int TWO_MINUTES = 1000 * 60 * 2;
...
Aggiungo un nuovo metodo a onLocationChanged
:
@Override
public void onLocationChanged(Location location) {
makeUseOfNewLocation(location);
if(currentBestLocation == null){
currentBestLocation = location;
}
....
}
/**
* This method modify the last know good location according to the arguments.
*
* @param location The possible new location.
*/
void makeUseOfNewLocation(Location location) {
if ( isBetterLocation(location, currentBestLocation) ) {
currentBestLocation = location;
}
}
....
/** Determines whether one location reading is better than the current location fix
* @param location The new location that you want to evaluate
* @param currentBestLocation The current location fix, to which you want to compare the new one.
*/
protected boolean isBetterLocation(Location location, Location currentBestLocation) {
if (currentBestLocation == null) {
// A new location is always better than no location
return true;
}
// Check whether the new location fix is newer or older
long timeDelta = location.getTime() - currentBestLocation.getTime();
boolean isSignificantlyNewer = timeDelta > TWO_MINUTES;
boolean isSignificantlyOlder = timeDelta < -TWO_MINUTES;
boolean isNewer = timeDelta > 0;
// If it's been more than two minutes since the current location, use the new location,
// because the user has likely moved.
if (isSignificantlyNewer) {
return true;
// If the new location is more than two minutes older, it must be worse.
} else if (isSignificantlyOlder) {
return false;
}
// Check whether the new location fix is more or less accurate
int accuracyDelta = (int) (location.getAccuracy() - currentBestLocation.getAccuracy());
boolean isLessAccurate = accuracyDelta > 0;
boolean isMoreAccurate = accuracyDelta < 0;
boolean isSignificantlyLessAccurate = accuracyDelta > 200;
// Check if the old and new location are from the same provider
boolean isFromSameProvider = isSameProvider(location.getProvider(),
currentBestLocation.getProvider());
// Determine location quality using a combination of timeliness and accuracy
if (isMoreAccurate) {
return true;
} else if (isNewer && !isLessAccurate) {
return true;
} else if (isNewer && !isSignificantlyLessAccurate && isFromSameProvider) {
return true;
}
return false;
}
// Checks whether two providers are the same
private boolean isSameProvider(String provider1, String provider2) {
if (provider1 == null) {
return provider2 == null;
}
return provider1.equals(provider2);
}
....
private Location currentBestLocation = null;
e aggiungere `makeUseOfNewLocation (location);` al metodo onLocationChanged (..)
Puoi trovare la posizione anche per GPS_PROVIDER or NETWORK_PROVIDER
.
Panoramica dei servizi di localizzazione in Android.
Ecco un esempio che tenta di trovare la posizione utilizzando il GPS. Se il tuo GPS non è disponibile, prova a utilizzare la rete per trovare la posizione.
GPSTracker.java
public class GPSTracker extends Service implements LocationListener {
private final Context mContext;
// Flag for GPS status
boolean isGPSEnabled = false;
// Flag for network status
boolean isNetworkEnabled = false;
// Flag for GPS status
boolean canGetLocation = false;
Location location; // Location
double latitude; // Latitude
double longitude; // Longitude
// The minimum distance to change Updates in meters
private static final long MIN_DISTANCE_CHANGE_FOR_UPDATES = 10; // 10 meters
// The minimum time between updates in milliseconds
private static final long MIN_TIME_BW_UPDATES = 1000 * 60 * 1; // 1 minute
// Declaring a Location Manager
protected LocationManager locationManager;
public GPSTracker(Context context) {
this.mContext = context;
getLocation();
}
public Location getLocation() {
try {
locationManager = (LocationManager) mContext
.getSystemService(LOCATION_SERVICE);
// Getting GPS status
isGPSEnabled = locationManager
.isProviderEnabled(LocationManager.GPS_PROVIDER);
// Getting network status
isNetworkEnabled = locationManager
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
// No network provider is enabled
} else {
this.canGetLocation = true;
if (isNetworkEnabled) {
locationManager.requestLocationUpdates(
LocationManager.NETWORK_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("Network", "Network");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
// If GPS enabled, get latitude/longitude using GPS Services
if (isGPSEnabled) {
if (location == null) {
locationManager.requestLocationUpdates(
LocationManager.GPS_PROVIDER,
MIN_TIME_BW_UPDATES,
MIN_DISTANCE_CHANGE_FOR_UPDATES, this);
Log.d("GPS Enabled", "GPS Enabled");
if (locationManager != null) {
location = locationManager
.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (location != null) {
latitude = location.getLatitude();
longitude = location.getLongitude();
}
}
}
}
}
}
catch (Exception e) {
e.printStackTrace();
}
return location;
}
/**
* Stop using GPS listener
* Calling this function will stop using GPS in your app.
* */
public void stopUsingGPS(){
if(locationManager != null){
locationManager.removeUpdates(GPSTracker.this);
}
}
/**
* Function to get latitude
* */
public double getLatitude(){
if(location != null){
latitude = location.getLatitude();
}
// return latitude
return latitude;
}
/**
* Function to get longitude
* */
public double getLongitude(){
if(location != null){
longitude = location.getLongitude();
}
// return longitude
return longitude;
}
/**
* Function to check GPS/Wi-Fi enabled
* @return boolean
* */
public boolean canGetLocation() {
return this.canGetLocation;
}
/**
* Function to show settings alert dialog.
* On pressing the Settings button it will launch Settings Options.
* */
public void showSettingsAlert(){
AlertDialog.Builder alertDialog = new AlertDialog.Builder(mContext);
// Setting Dialog Title
alertDialog.setTitle("GPS is settings");
// Setting Dialog Message
alertDialog.setMessage("GPS is not enabled. Do you want to go to settings menu?");
// On pressing the Settings button.
alertDialog.setPositiveButton("Settings", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog,int which) {
Intent intent = new Intent(Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mContext.startActivity(intent);
}
});
// On pressing the cancel button
alertDialog.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.cancel();
}
});
// Showing Alert Message
alertDialog.show();
}
@Override
public void onLocationChanged(Location location) {
}
@Override
public void onProviderDisabled(String provider) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public IBinder onBind(Intent arg0) {
return null;
}
}
Attività -AndroidGPSTrackingActivity.java
public class AndroidGPSTrackingActivity extends Activity {
Button btnShowLocation;
// GPSTracker class
GPSTracker gps;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
btnShowLocation = (Button) findViewById(R.id.btnShowLocation);
// Show location button click event
btnShowLocation.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
// Create class object
gps = new GPSTracker(AndroidGPSTrackingActivity.this);
// Check if GPS enabled
if(gps.canGetLocation()) {
double latitude = gps.getLatitude();
double longitude = gps.getLongitude();
// \n is for new line
Toast.makeText(getApplicationContext(), "Your Location is - \nLat: " + latitude + "\nLong: " + longitude, Toast.LENGTH_LONG).show();
} else {
// Can't get location.
// GPS or network is not enabled.
// Ask user to enable GPS/network in settings.
gps.showSettingsAlert();
}
}
});
}
}
Layout- main.xml
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical" >
<Button android:id="@+id/btnShowLocation"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Show Location"
android:layout_centerVertical="true"
android:layout_centerHorizontal="true"/>
</RelativeLayout>
AndroidManifest.xml
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.INTERNET" />
Ci sono già molte risposte lì, ma voglio mostrare il modo più recente per ottenere la posizione utilizzando l'API di Google, quindi i nuovi programmatori possono utilizzare il nuovo metodo:
Ho scritto un tutorial dettagliato sulla posizione corrente in Android sul mio blog demonuts.com Puoi anche trovare il codice sorgente completo sviluppato con Android Studio.
Prima di tutto, inseriscilo in un file gradle
compile 'com.google.android.gms:play-services:9.0.2'
quindi implementare le interfacce necessarie
public class MainActivity extends BaseActivitiy implements GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, com.google.android.gms.location.LocationListener
dichiarare istanze
private GoogleApiClient mGoogleApiClient;
private Location mLocation;
private LocationManager locationManager;
private LocationRequest mLocationRequest;
mettilo dentro onCreate()
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
Alla fine, sovrascrivi i metodi necessari
@Override
public void onConnected(Bundle bundle) {
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
} startLocationUpdates();
mLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
if(mLocation == null){
startLocationUpdates();
}
if (mLocation != null) {
double latitude = mLocation.getLatitude();
double longitude = mLocation.getLongitude();
} else {
// Toast.makeText(this, "Location not Detected", Toast.LENGTH_SHORT).show();
}
}
protected void startLocationUpdates() {
// Create the location request
mLocationRequest = LocationRequest.create()
.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY)
.setInterval(UPDATE_INTERVAL)
.setFastestInterval(FASTEST_INTERVAL);
// Request location updates
if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED && ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
// TODO: Consider calling
// ActivityCompat#requestPermissions
// here to request the missing permissions, and then overriding
// public void onRequestPermissionsResult(int requestCode, String[] permissions,
// int[] grantResults)
// to handle the case where the user grants the permission. See the documentation
// for ActivityCompat#requestPermissions for more details.
return;
}
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient,
mLocationRequest, this);
Log.d("reque", "--->>>>");
}
@Override
public void onConnectionSuspended(int i) {
Log.i(TAG, "Connection Suspended");
mGoogleApiClient.connect();
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
Log.i(TAG, "Connection failed. Error: " + connectionResult.getErrorCode());
}
@Override
public void onStart() {
super.onStart();
mGoogleApiClient.connect();
}
@Override
public void onStop() {
super.onStop();
if (mGoogleApiClient.isConnected()) {
mGoogleApiClient.disconnect();
}
}
@Override
public void onLocationChanged(Location location) {
}
Non dimenticare di avviare il GPS sul dispositivo prima di eseguire l'app.
mLocation
dà sempre null. Ho provato lo stesso menzionato
compile 'com.google.android.gms:play-services-location:11.0.4'
invece di aggiungere tutti i servizi di Google Play alla tua app.
Dato che non mi piaceva un po 'del codice nelle altre risposte, ecco la mia semplice soluzione. Questa soluzione è pensata per essere utilizzabile in un'attività o servizio per tracciare la posizione. Si assicura che non restituisca mai dati troppo vecchi a meno che non si richiedano esplicitamente dati non aggiornati. Può essere eseguito in una modalità di richiamata per ottenere gli aggiornamenti quando li riceviamo o in modalità di polling per eseguire il polling per le informazioni più recenti.
Interfaccia LocationTracker generica. Ci consente di avere più tipi di localizzatori di localizzazione e di collegare facilmente quello appropriato:
package com.gabesechan.android.reusable.location;
import android.location.Location;
public interface LocationTracker {
public interface LocationUpdateListener{
public void onUpdate(Location oldLoc, long oldTime, Location newLoc, long newTime);
}
public void start();
public void start(LocationUpdateListener update);
public void stop();
public boolean hasLocation();
public boolean hasPossiblyStaleLocation();
public Location getLocation();
public Location getPossiblyStaleLocation();
}
ProviderLocationTracker: questa classe terrà traccia della posizione per GPS o NETWORK.
package com.gabesechan.android.reusable.location;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.os.Bundle;
public class ProviderLocationTracker implements LocationListener, LocationTracker {
// The minimum distance to change Updates in meters
private static final long MIN_UPDATE_DISTANCE = 10;
// The minimum time between updates in milliseconds
private static final long MIN_UPDATE_TIME = 1000 * 60;
private LocationManager lm;
public enum ProviderType{
NETWORK,
GPS
};
private String provider;
private Location lastLocation;
private long lastTime;
private boolean isRunning;
private LocationUpdateListener listener;
public ProviderLocationTracker(Context context, ProviderType type) {
lm = (LocationManager)context.getSystemService(Context.LOCATION_SERVICE);
if(type == ProviderType.NETWORK){
provider = LocationManager.NETWORK_PROVIDER;
}
else{
provider = LocationManager.GPS_PROVIDER;
}
}
public void start(){
if(isRunning){
//Already running, do nothing
return;
}
//The provider is on, so start getting updates. Update current location
isRunning = true;
lm.requestLocationUpdates(provider, MIN_UPDATE_TIME, MIN_UPDATE_DISTANCE, this);
lastLocation = null;
lastTime = 0;
return;
}
public void start(LocationUpdateListener update) {
start();
listener = update;
}
public void stop(){
if(isRunning){
lm.removeUpdates(this);
isRunning = false;
listener = null;
}
}
public boolean hasLocation(){
if(lastLocation == null){
return false;
}
if(System.currentTimeMillis() - lastTime > 5 * MIN_UPDATE_TIME){
return false; //stale
}
return true;
}
public boolean hasPossiblyStaleLocation(){
if(lastLocation != null){
return true;
}
return lm.getLastKnownLocation(provider)!= null;
}
public Location getLocation(){
if(lastLocation == null){
return null;
}
if(System.currentTimeMillis() - lastTime > 5 * MIN_UPDATE_TIME){
return null; //stale
}
return lastLocation;
}
public Location getPossiblyStaleLocation(){
if(lastLocation != null){
return lastLocation;
}
return lm.getLastKnownLocation(provider);
}
public void onLocationChanged(Location newLoc) {
long now = System.currentTimeMillis();
if(listener != null){
listener.onUpdate(lastLocation, lastTime, newLoc, now);
}
lastLocation = newLoc;
lastTime = now;
}
public void onProviderDisabled(String arg0) {
}
public void onProviderEnabled(String arg0) {
}
public void onStatusChanged(String arg0, int arg1, Bundle arg2) {
}
}
È il FallbackLocationTracker, che seguirà sia il GPS che la RETE e utilizzerà qualunque posizione sia più accurata.
package com.gabesechan.android.reusable.location;
import android.content.Context;
import android.location.Location;
import android.location.LocationManager;
public class FallbackLocationTracker implements LocationTracker, LocationTracker.LocationUpdateListener {
private boolean isRunning;
private ProviderLocationTracker gps;
private ProviderLocationTracker net;
private LocationUpdateListener listener;
Location lastLoc;
long lastTime;
public FallbackLocationTracker(Context context) {
gps = new ProviderLocationTracker(context, ProviderLocationTracker.ProviderType.GPS);
net = new ProviderLocationTracker(context, ProviderLocationTracker.ProviderType.NETWORK);
}
public void start(){
if(isRunning){
//Already running, do nothing
return;
}
//Start both
gps.start(this);
net.start(this);
isRunning = true;
}
public void start(LocationUpdateListener update) {
start();
listener = update;
}
public void stop(){
if(isRunning){
gps.stop();
net.stop();
isRunning = false;
listener = null;
}
}
public boolean hasLocation(){
//If either has a location, use it
return gps.hasLocation() || net.hasLocation();
}
public boolean hasPossiblyStaleLocation(){
//If either has a location, use it
return gps.hasPossiblyStaleLocation() || net.hasPossiblyStaleLocation();
}
public Location getLocation(){
Location ret = gps.getLocation();
if(ret == null){
ret = net.getLocation();
}
return ret;
}
public Location getPossiblyStaleLocation(){
Location ret = gps.getPossiblyStaleLocation();
if(ret == null){
ret = net.getPossiblyStaleLocation();
}
return ret;
}
public void onUpdate(Location oldLoc, long oldTime, Location newLoc, long newTime) {
boolean update = false;
//We should update only if there is no last location, the provider is the same, or the provider is more accurate, or the old location is stale
if(lastLoc == null){
update = true;
}
else if(lastLoc != null && lastLoc.getProvider().equals(newLoc.getProvider())){
update = true;
}
else if(newLoc.getProvider().equals(LocationManager.GPS_PROVIDER)){
update = true;
}
else if (newTime - lastTime > 5 * 60 * 1000){
update = true;
}
if(update){
if(listener != null){
listener.onUpdate(lastLoc, lastTime, newLoc, newTime);
}
lastLoc = newLoc;
lastTime = newTime;
}
}
}
Poiché entrambi implementano l'interfaccia LocationTracker, puoi facilmente cambiare idea su quale utilizzare. Per eseguire la classe in modalità polling, basta chiamare start (). Per eseguirlo in modalità di aggiornamento, chiamare start (Listener).
FallbackLocationTracker fallbackLocationTracker = new FallbackLocationTracker(mContext); fallbackLocationTracker.start(); if (fallbackLocationTracker.hasLocation()) { return fallbackLocationTracker.getLocation(); }
Ottieni la posizione dei gps di -
LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
LocationListener locationListener = new LocationListener()
{
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
// TODO Auto-generated method stub
}
@Override
public void onProviderEnabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onProviderDisabled(String provider) {
// TODO Auto-generated method stub
}
@Override
public void onLocationChanged(Location location) {
// TODO Auto-generated method stub
double latitude = location.getLatitude();
double longitude = location.getLongitude();
double speed = location.getSpeed(); //spedd in meter/minute
speed = (speed*3600)/1000; // speed in km/minute Toast.makeText(GraphViews.this, "Current speed:" + location.getSpeed(),Toast.LENGTH_SHORT).show();
}
};
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
}
location.getSpeed()
restituisce la velocità in metri / sec (non metri / min).
È necessario utilizzare l'ultimo / il più recente
GoogleApiClient Api
Fondamentalmente quello che devi fare è:
private GoogleApiClient mGoogleApiClient;
mGoogleApiClient = new GoogleApiClient.Builder(this)
.addApi(LocationServices.API)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.build();
Poi
@Override
public void onConnected(Bundle connectionHint) {
mLastLocation = LocationServices.FusedLocationApi.getLastLocation(
mGoogleApiClient);
if (mLastLocation != null) {
mLatitudeText.setText(String.valueOf(mLastLocation.getLatitude()));
mLongitudeText.setText(String.valueOf(mLastLocation.getLongitude()));
}
}
per la posizione più accurata e affidabile. Vedi il mio post qui:
https://stackoverflow.com/a/33599228/2644905
Non utilizzare LocationListener che non è preciso e ha una risposta ritardata. Ad essere onesti, questo è più facile da implementare. Leggi anche la documentazione: https://developers.google.com/android/reference/com/google/android/gms/common/api/GoogleApiClient
class MyLocation {
Timer timer1;
LocationManager lm;
LocationResult locationResult;
boolean gps_enabled = false;
boolean network_enabled = false;
public boolean getLocation(Context context, LocationResult result) {
// I use LocationResult callback class to pass location value from
// MyLocation to user code.
locationResult = result;
if (lm == null)
lm = (LocationManager) context
.getSystemService(Context.LOCATION_SERVICE);
// Exceptions will be thrown if the provider is not permitted.
try {
gps_enabled = lm.isProviderEnabled(LocationManager.GPS_PROVIDER);
}
catch (Exception ex) {
}
try {
network_enabled = lm
.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
}
catch (Exception ex) {
}
// Don't start listeners if no provider is enabled.
if (!gps_enabled && !network_enabled)
return false;
if (gps_enabled)
lm.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0,
locationListenerGps);
if (network_enabled)
lm.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0,
locationListenerNetwork);
timer1 = new Timer();
timer1.schedule(new GetLastLocation(), 5000);
return true;
}
LocationListener locationListenerGps = new LocationListener() {
public void onLocationChanged(Location location) {
timer1.cancel();
locationResult.gotLocation(location);
lm.removeUpdates(this);
lm.removeUpdates(locationListenerNetwork);
}
public void onProviderDisabled(String provider) {
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
};
LocationListener locationListenerNetwork = new LocationListener() {
public void onLocationChanged(Location location) {
timer1.cancel();
locationResult.gotLocation(location);
lm.removeUpdates(this);
lm.removeUpdates(locationListenerGps);
}
public void onProviderDisabled(String provider) {
}
public void onProviderEnabled(String provider) {
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
};
class GetLastLocation extends TimerTask {
@Override
public void run() {
lm.removeUpdates(locationListenerGps);
lm.removeUpdates(locationListenerNetwork);
Location net_loc = null, gps_loc = null;
if (gps_enabled)
gps_loc = lm.getLastKnownLocation(LocationManager.GPS_PROVIDER);
if (network_enabled)
net_loc = lm
.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
// If there are both values, use the latest one.
if (gps_loc != null && net_loc != null) {
if (gps_loc.getTime() > net_loc.getTime())
locationResult.gotLocation(gps_loc);
else
locationResult.gotLocation(net_loc);
return;
}
if (gps_loc != null) {
locationResult.gotLocation(gps_loc);
return;
}
if (net_loc != null) {
locationResult.gotLocation(net_loc);
return;
}
locationResult.gotLocation(null);
}
}
public static abstract class LocationResult {
public abstract void gotLocation(Location location);
}
}
Spero che questo ti possa aiutare ...
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
Ora che i servizi di localizzazione di Google Play sono qui, consiglio agli sviluppatori di iniziare a utilizzare il nuovo provider di localizzazione fusa. Lo troverai più facile da usare e più preciso. Guarda il video I / O di Google Oltre il punto blu: nuove funzionalità in Posizione Android dei due ragazzi che hanno creato la nuova API dei servizi di localizzazione di Google Play.
Ho lavorato con le API di localizzazione su diverse piattaforme mobili e penso che quello che hanno fatto questi due ragazzi sia davvero rivoluzionario. Si è sbarazzato di un'enorme quantità di complessità nell'uso dei vari provider. Stack Overflow è pieno di domande su quale provider utilizzare, se utilizzare l'ultima posizione nota, come impostare altre proprietà sul LocationManager, ecc. Questa nuova API che hanno creato rimuove la maggior parte di tali incertezze e rende piacevole il servizio di localizzazione uso.
Ho scritto un'app Android che ottiene periodicamente la posizione utilizzando i servizi di localizzazione di Google Play e invia la posizione a un server Web in cui è memorizzata in un database e può essere visualizzata su Google Maps . Ho scritto sia il software client (per Android, iOS, Windows Phone e Java ME ) sia il software server (per ASP.NET e SQL Server o PHP e MySQL ). Il software è scritto nella lingua madre su ciascuna piattaforma e funziona correttamente in background su ciascuna piattaforma. Infine, il software ha la licenza MIT . Puoi trovare il client Android qui:
https://github.com/nickfox/GpsTracker/tree/master/phoneClients/android
Il più semplice che puoi trovare
package com.javapapers.android.geolocationfinder;
import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.location.Location;
import android.location.LocationListener;
import android.location.LocationManager;
import android.widget.TextView;
import android.util.Log;
public class MainActivity extends Activity implements LocationListener{
protected LocationManager locationManager;
protected LocationListener locationListener;
protected Context context;
TextView txtLat;
String lat;
String provider;
protected String latitude,longitude;
protected boolean gps_enabled,network_enabled;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
txtLat = (TextView) findViewById(R.id.textview1);
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, this);
}
@Override
public void onLocationChanged(Location location) {
txtLat = (TextView) findViewById(R.id.textview1);
txtLat.setText("Latitude:" + location.getLatitude() + ", Longitude:" + location.getLongitude());
}
@Override
public void onProviderDisabled(String provider) {
Log.d("Latitude","disable");
}
@Override
public void onProviderEnabled(String provider) {
Log.d("Latitude","enable");
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
Log.d("Latitude","status");
}
}
LocationManager è una classe che fornisce metodi incorporati per ottenere l'ultima posizione nota
PASSAGGIO 1: creare un oggetto LocationManager come di seguito
LocationManager locationManager = (LocationManager) context.getSystemService (Context.LOCATION_SERVICE);
PASSAGGIO 2: aggiungere criteri
*Criteria is use for setting accuracy*
Criteria criteria = new Criteria();
int currentapiVersion = android.os.Build.VERSION.SDK_INT;
if (currentapiVersion >= android.os.Build.VERSION_CODES.HONEYCOMB) {
criteria.setSpeedAccuracy(Criteria.ACCURACY_HIGH);
criteria.setAccuracy(Criteria.ACCURACY_FINE);
criteria.setAltitudeRequired(true);
criteria.setBearingRequired(true);
criteria.setSpeedRequired(true);
}
PASSAGGIO 3: OTTIENI Provider disponibile
Esistono due tipi di provider GPS e di rete
String provider = locationManager.getBestProvider(criteria, true);
PASSAGGIO 4: Ottieni l'ultima posizione nota
Location location = locationManager.getLastKnownLocation(provider);
PASSAGGIO 5: Ottieni latitudine e longitudine
Se la posizione oggetto è nullo quindi provare Dont alla chiamata di seguito il metodo s
getLatitude and getLongitude is methods which returns double values
Ottenere aggiornamenti di posizione richiede un sacco di codice bolierplate in Android, devi prenderti cura di
Per facilitare tutti questi passaggi ho creato Android-EasyLocation (piccola libreria Android) che si occuperà di tutte queste cose e puoi concentrarti sulla logica aziendale.
Tutto ciò che serve è estendere EasyLocationActivity e questo
requestSingleLocationFix(easyLocationRequest);
o
requestLocationUpdates(easyLocationRequest);
Verifica l'app di esempio e i passaggi necessari qui su https://github.com/akhgupta/Android-EasyLocation
Ho realizzato un progetto dal quale possiamo ottenere la posizione precisa utilizzando Google Play Services, GPS e provider di rete. Questo progetto può essere trovato qui .
La strategia per trovare la posizione migliore è quella di ottenere prima la posizione dai servizi di Google Play se viene trovata la posizione, quindi controllare il tempo è meglio o no, se la posizione trovata è null riavviare i servizi di Google Play e provare a recuperare la posizione dall'API di posizione di Android. Registra la posizione sui listener di modifica e quando viene trovata la posizione migliore la richiamata la riporta all'attività principale.
È molto semplice da usare e implementare nel codice solo due classi che dobbiamo incorporare, ovvero LocationManagerInterface
e SmartLocationManager
, LocationActivity
sta implementando l'interfaccia e usando SmartLocationManager per recuperare la posizione.
/**
* Created by Syed Raza Mehdi Naqvi on 8/10/2016.
*/
public interface LocationManagerInterface {
String TAG = LocationManagerInterface.class.getSimpleName();
void locationFetched(Location mLocation, Location oldLocation, String time, String locationProvider);
}
ecco la classe del gestore della posizione
import android.Manifest;
import android.app.Activity;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentSender;
import android.content.pm.PackageManager;
import android.location.Location;
import android.location.LocationManager;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AlertDialog;
import android.util.Log;
import android.widget.Toast;
import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GooglePlayServicesUtil;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import java.text.DateFormat;
import java.util.Date;
/**
* Created by Syed Raza Mehdi Naqvi on 8/9/2016.
*/
public class SmartLocationManager implements
GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener, LocationListener {
private static final String TAG = SmartLocationManager.class.getSimpleName();
private static final int TWO_MINUTES = 1000 * 60 * 2;
private static final int PERMISSION_REQUEST_CODE = 1000;
private static final int CONNECTION_FAILURE_RESOLUTION_REQUEST = 9000;
// default value is false but user can change it
private String mLastLocationUpdateTime; // fetched location time
private String locationProvider; // source of fetched location
private Location mLastLocationFetched; // location fetched
private Location mLocationFetched; // location fetched
private Location networkLocation;
private Location gpsLocation;
private int mLocationPiority;
private long mLocationFetchInterval;
private long mFastestLocationFetchInterval;
private Context mContext; // application context
private Activity mActivity; // activity context
private LocationRequest mLocationRequest;
private GoogleApiClient mGoogleApiClient;
private LocationManagerInterface mLocationManagerInterface;
private android.location.LocationManager locationManager;
private android.location.LocationListener locationListener;
boolean isGPSEnabled;
boolean isNetworkEnabled;
private int mProviderType;
public static final int NETWORK_PROVIDER = 1;
public static final int ALL_PROVIDERS = 0;
public static final int GPS_PROVIDER = 2;
// private final double STANDARD_LOCATION_ACCURACY = 100.0;
// private final double STANDARD_LOCATION_SEED_LIMIT = 6.95;
public static final int LOCATION_PROVIDER_ALL_RESTICTION = 1;
public static final int LOCATION_PROVIDER_RESTRICTION_NONE = 0;
public static final int LOCATION_PROVIDER_GPS_ONLY_RESTICTION = 2;
public static final int LOCATION_PROVIDER_NETWORK_ONLY_RESTICTION = 3;
private int mForceNetworkProviders = 0;
public SmartLocationManager(Context context, Activity activity, LocationManagerInterface locationInterface, int providerType, int locationPiority, long locationFetchInterval, long fastestLocationFetchInterval, int forceNetworkProviders) {
mContext = context;
mActivity = activity;
mProviderType = providerType;
mLocationPiority = locationPiority;
mForceNetworkProviders = forceNetworkProviders;
mLocationFetchInterval = locationFetchInterval;
mFastestLocationFetchInterval = fastestLocationFetchInterval;
mLocationManagerInterface = locationInterface;
initSmartLocationManager();
}
public void initSmartLocationManager() {
// 1) ask for permission for Android 6 above to avoid crash
// 2) check if gps is available
// 3) get location using awesome strategy
askLocationPermission(); // for android version 6 above
checkNetworkProviderEnable(mForceNetworkProviders); //
if (isGooglePlayServicesAvailable()) // if googleplay services available
initLocationObjts(); // init obj for google play service and start fetching location
else
getLocationUsingAndroidAPI(); // otherwise get location using Android API
}
private void initLocationObjts() {
// Create the LocationRequest object
mLocationRequest = LocationRequest.create()
.setPriority(mLocationPiority)
.setInterval(mLocationFetchInterval) // 10 seconds, in milliseconds
.setFastestInterval(mFastestLocationFetchInterval); // 1 second, in milliseconds
if (mGoogleApiClient == null) {
mGoogleApiClient = new GoogleApiClient.Builder(mActivity)
.addConnectionCallbacks(this)
.addOnConnectionFailedListener(this)
.addApi(LocationServices.API)
.build();
}
startLocationFetching(); // connect google play services to fetch location
}
@Override
public void onConnected(Bundle connectionHint) {
Location location = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
startLocationUpdates();
if (location == null) {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
getLocationUsingAndroidAPI();
} else {
setNewLocation(getBetterLocation(location, mLocationFetched), mLocationFetched);
}
}
@Override
public void onLocationChanged(Location location) {
if (location == null) {
getLastKnownLocation();
} else {
setNewLocation(getBetterLocation(location, mLocationFetched), mLocationFetched);
}
}
@Override
public void onConnectionSuspended(int i) {
Log.i(TAG, "Connection suspended");
}
@Override
public void onConnectionFailed(ConnectionResult connectionResult) {
if (connectionResult.hasResolution()) {
try {
connectionResult.startResolutionForResult(mActivity, CONNECTION_FAILURE_RESOLUTION_REQUEST); // Start an Activity that tries to resolve the error
getLocationUsingAndroidAPI(); // try to get location using Android API locationManager
} catch (IntentSender.SendIntentException e) {
e.printStackTrace();
}
} else {
Log.i(TAG, "Location services connection failed with code " + connectionResult.getErrorCode());
}
}
private void setNewLocation(Location location, Location oldLocation) {
if (location != null) {
mLastLocationFetched = oldLocation;
mLocationFetched = location;
mLastLocationUpdateTime = DateFormat.getTimeInstance().format(new Date());
locationProvider = location.getProvider();
mLocationManagerInterface.locationFetched(location, mLastLocationFetched, mLastLocationUpdateTime, location.getProvider());
}
}
private void getLocationUsingAndroidAPI() {
// Acquire a reference to the system Location Manager
locationManager = (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);
setLocationListner();
captureLocation();
}
public void captureLocation() {
if (Build.VERSION.SDK_INT >= 23 &&
ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
try {
if (mProviderType == SmartLocationManager.GPS_PROVIDER) {
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
} else if (mProviderType == SmartLocationManager.NETWORK_PROVIDER) {
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
} else {
locationManager.requestLocationUpdates(LocationManager.NETWORK_PROVIDER, 0, 0, locationListener);
locationManager.requestLocationUpdates(LocationManager.GPS_PROVIDER, 0, 0, locationListener);
}
} catch (Exception e) {
Log.e(TAG, e.getMessage());
}
}
private void setLocationListner() {
// Define a listener that responds to location updates
locationListener = new android.location.LocationListener() {
public void onLocationChanged(Location location) {
// Called when a new location is found by the network location provider.
if (location == null) {
getLastKnownLocation();
} else {
setNewLocation(getBetterLocation(location, mLocationFetched), mLocationFetched);
// if (isLocationAccurate(location) && location.getAccuracy() < STANDARD_LOCATION_ACCURACY && location.getSpeed() < STANDARD_LOCATION_SEED_LIMIT) {// no use of this if
// setNewLocation(getBetterLocation(location, mLocationFetched), mLocationFetched);
// } else {
// setNewLocation(getBetterLocation(location, mLocationFetched), mLocationFetched);
// }
}
}
public void onStatusChanged(String provider, int status, Bundle extras) {
}
public void onProviderEnabled(String provider) {
}
public void onProviderDisabled(String provider) {
}
};
}
public Location getAccurateLocation() {
if (Build.VERSION.SDK_INT >= 23 &&
ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return null;
}
try {
gpsLocation = locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
networkLocation = locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
Location newLocalGPS, newLocalNetwork;
if (gpsLocation != null || networkLocation != null) {
newLocalGPS = getBetterLocation(mLocationFetched, gpsLocation);
newLocalNetwork = getBetterLocation(mLocationFetched, networkLocation);
setNewLocation(getBetterLocation(newLocalGPS, newLocalNetwork), mLocationFetched);
}
} catch (Exception ex) {
Log.e(TAG, ex.getMessage());
}
return mLocationFetched;
}
protected void startLocationUpdates() {
LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);
}
public void startLocationFetching() {
mGoogleApiClient.connect();
if (mGoogleApiClient.isConnected()) {
startLocationUpdates();
}
}
public void pauseLocationFetching() {
if (mGoogleApiClient.isConnected()) {
LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
mGoogleApiClient.disconnect();
}
}
public void abortLocationFetching() {
mGoogleApiClient.disconnect();
// Remove the listener you previously added
if (locationManager != null && locationListener != null) {
if (Build.VERSION.SDK_INT >= 23 &&
ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
try {
locationManager.removeUpdates(locationListener);
locationManager = null;
} catch (Exception ex) {
Log.e(TAG, ex.getMessage());
}
}
}
public void resetLocation() {
mLocationFetched = null;
mLastLocationFetched = null;
networkLocation = null;
gpsLocation = null;
}
// Android M Permission check
public void askLocationPermission() {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.M) {
if (ContextCompat.checkSelfPermission(mActivity, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED
|| ContextCompat.checkSelfPermission(mActivity, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED
) {
if (ActivityCompat.shouldShowRequestPermissionRationale(mActivity, Manifest.permission.ACCESS_COARSE_LOCATION)
|| ActivityCompat.shouldShowRequestPermissionRationale(mActivity, Manifest.permission.ACCESS_FINE_LOCATION)) {
final AlertDialog.Builder builder = new AlertDialog.Builder(mActivity);
builder.setMessage("Please allow all permissions in App Settings for additional functionality.")
.setCancelable(false)
.setPositiveButton("Allow", new DialogInterface.OnClickListener() {
public void onClick(@SuppressWarnings("unused") final DialogInterface dialog, @SuppressWarnings("unused") final int id) {
Toast.makeText(mContext, "Welcome", Toast.LENGTH_SHORT).show();
}
})
.setNegativeButton("Deny", new DialogInterface.OnClickListener() {
public void onClick(final DialogInterface dialog, @SuppressWarnings("unused") final int id) {
mActivity.finish();
}
});
final AlertDialog alert = builder.create();
alert.show();
} else
ActivityCompat.requestPermissions(mActivity, new String[]{Manifest.permission.ACCESS_COARSE_LOCATION
, Manifest.permission.ACCESS_FINE_LOCATION
}, PERMISSION_REQUEST_CODE);
}
}
}
public void checkNetworkProviderEnable(int enforceActive) {
locationManager = (LocationManager) mContext.getSystemService(Context.LOCATION_SERVICE);
isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (!isGPSEnabled && !isNetworkEnabled) {
buildAlertMessageTurnOnLocationProviders("Your location providers seems to be disabled, please enable it", "OK", "Cancel");
} else if (!isGPSEnabled && mForceNetworkProviders == LOCATION_PROVIDER_GPS_ONLY_RESTICTION) {
buildAlertMessageTurnOnLocationProviders("Your GPS seems to be disabled, please enable it", "OK", "Cancel");
} else if (!isNetworkEnabled && mForceNetworkProviders == LOCATION_PROVIDER_NETWORK_ONLY_RESTICTION) {
buildAlertMessageTurnOnLocationProviders("Your Network location provider seems to be disabled, please enable it", "OK", "Cancel");
}
// getting network status
if (!isGPSEnabled && !isNetworkEnabled) {
Toast.makeText(mContext, "Location can't be fetched!", Toast.LENGTH_SHORT).show(); // show alert
mActivity.finish();
}
}
private void buildAlertMessageTurnOnLocationProviders(String message, String positiveButtonText, String negativeButtonText) {
final AlertDialog.Builder builder = new AlertDialog.Builder(mActivity);
builder.setMessage(message)
.setCancelable(false)
.setPositiveButton(positiveButtonText, new DialogInterface.OnClickListener() {
public void onClick(@SuppressWarnings("unused") final DialogInterface dialog, @SuppressWarnings("unused") final int id) {
Intent mIntent = new Intent(android.provider.Settings.ACTION_LOCATION_SOURCE_SETTINGS);
mIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
mContext.startActivity(mIntent);
}
})
.setNegativeButton(negativeButtonText, new DialogInterface.OnClickListener() {
public void onClick(final DialogInterface dialog, @SuppressWarnings("unused") final int id) {
mActivity.finish();
}
});
final AlertDialog alert = builder.create();
alert.show();
}
public Location getLastKnownLocation() {
locationProvider = LocationManager.NETWORK_PROVIDER;
Location lastKnownLocation = null;
// Or use LocationManager.GPS_PROVIDER
if (Build.VERSION.SDK_INT >= 23 &&
ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return lastKnownLocation;
}
try {
lastKnownLocation = locationManager.getLastKnownLocation(locationProvider);
return lastKnownLocation;
} catch (Exception e) {
Log.e(TAG, e.getMessage());
}
return lastKnownLocation;
}
public boolean isGooglePlayServicesAvailable() {
int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(mContext);
if (status == ConnectionResult.SUCCESS) {
return true;
} else {
return false;
}
}
/**
* Determines whether one Location reading is better than the current Location fix
*
* @param location The new Location that you want to evaluate
* @param currentBestLocation The current Location fix, to which you want to compare the new one
*/
protected Location getBetterLocation(Location location, Location currentBestLocation) {
if (currentBestLocation == null) {
// A new location is always better than no location
return location;
}
// Check whether the new location fix is newer or older
long timeDelta = location.getTime() - currentBestLocation.getTime();
boolean isSignificantlyNewer = timeDelta > TWO_MINUTES;
boolean isSignificantlyOlder = timeDelta < -TWO_MINUTES;
boolean isNewer = timeDelta > 0;
// If it's been more than two minutes since the current location, use the new location
// because the user has likely moved
if (isSignificantlyNewer) {
return location;
// If the new location is more than two minutes older, it must be worse
} else if (isSignificantlyOlder) {
return currentBestLocation;
}
// Check whether the new location fix is more or less accurate
int accuracyDelta = (int) (location.getAccuracy() - currentBestLocation.getAccuracy());
boolean isLessAccurate = accuracyDelta > 0;
boolean isMoreAccurate = accuracyDelta < 0;
boolean isSignificantlyLessAccurate = accuracyDelta > 200;
// Check if the old and new location are from the same provider
boolean isFromSameProvider = isSameProvider(location.getProvider(),
currentBestLocation.getProvider());
// Determine location quality using a combination of timeliness and accuracy
if (isMoreAccurate) {
return location;
} else if (isNewer && !isLessAccurate) {
return location;
} else if (isNewer && !isSignificantlyLessAccurate && isFromSameProvider) {
return location;
}
return currentBestLocation;
}
/**
* Checks whether two providers are the same
*/
private boolean isSameProvider(String provider1, String provider2) {
if (provider1 == null) {
return provider2 == null;
}
return provider1.equals(provider2);
}
public boolean isLocationAccurate(Location location) {
if (location.hasAccuracy()) {
return true;
} else {
return false;
}
}
public Location getStaleLocation() {
if (mLastLocationFetched != null) {
return mLastLocationFetched;
}
if (Build.VERSION.SDK_INT >= 23 &&
ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ContextCompat.checkSelfPermission(mContext, android.Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return null;
}
if (mProviderType == SmartLocationManager.GPS_PROVIDER) {
return locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER);
} else if (mProviderType == SmartLocationManager.NETWORK_PROVIDER) {
return locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER);
} else {
return getBetterLocation(locationManager.getLastKnownLocation(LocationManager.NETWORK_PROVIDER), locationManager.getLastKnownLocation(LocationManager.GPS_PROVIDER));
}
}
}
possiamo usarlo con l'attività o un frammento, qui lo sto usando con l'attività
import android.location.Location;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.TextView;
import android.widget.Toast;
import com.example.raza.locationaware.location.LocationManagerInterface;
import com.example.raza.locationaware.location.SmartLocationManager;
import com.google.android.gms.location.LocationRequest;
public class LocationActivity extends AppCompatActivity implements LocationManagerInterface {
public static final String TAG = LocationActivity.class.getSimpleName();
SmartLocationManager mLocationManager;
TextView mLocalTV, mLocationProviderTV, mlocationTimeTV;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_location);
mLocationManager = new SmartLocationManager(getApplicationContext(), this, this, SmartLocationManager.ALL_PROVIDERS, LocationRequest.PRIORITY_HIGH_ACCURACY, 10 * 1000, 1 * 1000, SmartLocationManager.LOCATION_PROVIDER_RESTRICTION_NONE); // init location manager
mLocalTV = (TextView) findViewById(R.id.locationDisplayTV);
mLocationProviderTV = (TextView) findViewById(R.id.locationProviderTV);
mlocationTimeTV = (TextView) findViewById(R.id.locationTimeFetchedTV);
}
protected void onStart() {
super.onStart();
mLocationManager.startLocationFetching();
}
protected void onStop() {
super.onStop();
mLocationManager.abortLocationFetching();
}
@Override
protected void onPause() {
super.onPause();
mLocationManager.pauseLocationFetching();
}
@Override
public void locationFetched(Location mLocal, Location oldLocation, String time, String locationProvider) {
Toast.makeText(getApplication(), "Lat : " + mLocal.getLatitude() + " Lng : " + mLocal.getLongitude(), Toast.LENGTH_LONG).show();
mLocalTV.setText("Lat : " + mLocal.getLatitude() + " Lng : " + mLocal.getLongitude());
mLocationProviderTV.setText(locationProvider);
mlocationTimeTV.setText(time);
}
}
Spero che sia d'aiuto, se puoi suggerire qualche miglioramento, pubblicalo gentilmente su Git . Grazie.
GoogleSamples ha un esempio dettagliato che utilizza l'ultimo FusedLocationProviderApi. Sfortunatamente le risposte più votate non sono aggiornate.
Segui gli esempi seguenti per implementare i servizi di localizzazione usando FusedLocationProviderApi
https://github.com/googlesamples/android-play-location/tree/master/LocationUpdates
Se stai creando nuovi progetti di localizzazione per Android, dovresti utilizzare il nuovo Google Play servizi di localizzazione di . È molto più preciso e molto più semplice da usare.
Ho lavorato su un progetto di localizzatore GPS open source , GpsTracker, per diversi anni. Di recente l'ho aggiornato per gestire aggiornamenti periodici da telefoni cellulari Android, iOS, Windows Phone e Java ME . È completamente funzionale e fa ciò di cui hai bisogno e ha la licenza MIT .
Il progetto Android all'interno di GpsTracker utilizza i nuovi servizi di Google Play e ci sono anche due stack di server ( ASP.NET e PHP ) per permetterti di tracciare quei telefoni.
Per il solo controllo della posizione è possibile utilizzare il seguente codice. Puoi inserirlo nel tuo onStart () dell'attività principale e visualizzare la finestra di avviso se il ritorno è falso.
private boolean isLocationAccurate()
{
if (Build.VERSION.SDK_INT < Build.VERSION_CODES.KITKAT)
{
String provider = Settings.Secure
.getString(getContentResolver(), Settings.Secure.LOCATION_PROVIDERS_ALLOWED);
if (provider != null && !provider.contains("gps"))
{
return false;
}
}
else
{
try
{
int status = Settings.Secure
.getInt(this.getContentResolver(), Settings.Secure.LOCATION_MODE);
if (status != Settings.Secure.LOCATION_MODE_HIGH_ACCURACY)
{
return false;
}
}
catch (Settings.SettingNotFoundException e)
{
Log.e(TAG, e.getMessage());
}
}
return true;
}
Ho ottenuto una posizione molto accurata utilizzando FusedLocationProviderClient
( sono richiesti i servizi di Google Play )
Autorizzazioni necessarie
android.permission.ACCESS_FINE_LOCATION
android.permission.ACCESS_COARSE_LOCATION
Dipendenza
'Com.google.android.gms: play-servizi-location: 15.0.0'
Codice di Kotlin
val client = FusedLocationProviderClient(this)
val location = client.lastLocation
location.addOnCompleteListener {
// this is a lambda expression and we get an 'it' iterator to access the 'result'
// it.result.latitude gives the latitude
// it.result.longitude gives the longitude
val geocoder = Geocoder(applicationContext, Locale.getDefault())
val address = geocoder.getFromLocation(it.result.latitude, it.result.longitude, 1)
if (address != null && address.size > 0) {
// Get the current city
city = address[0].locality
}
}
location.addOnFailureListener {
// Some error in getting the location, let's log it
Log.d("xtraces", it.message)
}
Il modo migliore per recuperare la posizione è di seguito
// put dependancy
implementation 'com.google.android.gms:play-services-location:11.0.4'
// PUT permissions in Menifest
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
// create a Java file as below
public class SingleShotLocationProvider {
public static interface LocationCallback {
public void onNewLocationAvailable(GPSCoordinates location);
}
// calls back to calling thread, note this is for low grain: if you want higher precision, swap the
// contents of the else and if. Also be sure to check gps permission/settings are allowed.
// call usually takes <10ms
public static void requestSingleUpdate(final Context context, final LocationCallback callback) {
final LocationManager locationManager = (LocationManager) context.getSystemService(Context.LOCATION_SERVICE);
boolean isNetworkEnabled = locationManager.isProviderEnabled(LocationManager.NETWORK_PROVIDER);
if (isNetworkEnabled) {
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_COARSE);
if (ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED &&
ActivityCompat.checkSelfPermission(context, Manifest.permission.ACCESS_COARSE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
return;
}
locationManager.requestSingleUpdate(criteria, new LocationListener() {
@Override
public void onLocationChanged(Location location) {
callback.onNewLocationAvailable(new GPSCoordinates(location.getLatitude(), location.getLongitude()));
}
@Override
public void onStatusChanged(String provider, int status, Bundle extras) {
}
@Override
public void onProviderEnabled(String provider) {
}
@Override
public void onProviderDisabled(String provider) {
}
}, null);
} else {
boolean isGPSEnabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
if (isGPSEnabled) {
Criteria criteria = new Criteria();
criteria.setAccuracy(Criteria.ACCURACY_FINE);
locationManager.requestSingleUpdate(criteria, new LocationListener() {
@Override
public void onLocationChanged(Location location) {
callback.onNewLocationAvailable(new GPSCoordinates(location.getLatitude(), location.getLongitude()));
}
@Override public void onStatusChanged(String provider, int status, Bundle extras) { }
@Override public void onProviderEnabled(String provider) { }
@Override public void onProviderDisabled(String provider) { }
}, null);
}
}
}
// consider returning Location instead of this dummy wrapper class
public static class GPSCoordinates {
public float longitude = -1;
public float latitude = -1;
public GPSCoordinates(float theLatitude, float theLongitude) {
longitude = theLongitude;
latitude = theLatitude;
}
public GPSCoordinates(double theLatitude, double theLongitude) {
longitude = (float) theLongitude;
latitude = (float) theLatitude;
}
}
}
// FILE FINISHED
// FETCH LOCATION FROM ACTIVITY AS BELOW
public void getLocation(Context context) {
MyApplication.log(LOG_TAG, "getLocation() ");
SingleShotLocationProvider.requestSingleUpdate(context,
new SingleShotLocationProvider.LocationCallback() {
@Override
public void onNewLocationAvailable(SingleShotLocationProvider.GPSCoordinates loc) {
location = loc;
MyApplication.log(LOG_TAG, "getLocation() LAT: " + location.latitude + ", LON: " + location.longitude);
}
});
}
Ho pubblicato una piccola libreria che può semplificare il recupero dei dati sulla posizione in Android, si occupa anche delle autorizzazioni di runtime di Android M.
Puoi verificarlo qui: https://github.com/julioromano/RxLocation e utilizzarlo o il suo codice sorgente come esempi per l'implementazione.
Trova semplice Scrivi il codice nel metodo On Location
public void onLocationChanged(Location location) {
if (mCurrLocationMarker != null) {
mCurrLocationMarker.remove();
}
//Place current location marker
LatLng latLng = new LatLng(location.getLatitude(), location.getLongitude());
MarkerOptions markerOptions = new MarkerOptions();
markerOptions.position(latLng);
markerOptions.title("Current Position");
markerOptions.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_RED));
mCurrLocationMarker = mMap.addMarker(markerOptions);
//move map camera
mMap.moveCamera(CameraUpdateFactory.newLatLng(latLng));
mMap.animateCamera(CameraUpdateFactory.zoomTo(18));
PolylineOptions pOptions = new PolylineOptions()
.width(5)
.color(Color.GREEN)
.geodesic(true);
for (int z = 0; z < routePoints.size(); z++) {
LatLng point = routePoints.get(z);
pOptions.add(point);
}
line = mMap.addPolyline(pOptions);
routePoints.add(latLng);
}
Raccomanderò di utilizzare Smart Location Library
Molto semplice da usare e avvolge bene la logica della posizione.
Per avviare il servizio di localizzazione:
SmartLocation.with(context).location()
.start(new OnLocationUpdatedListener() { ... });
Se vuoi solo ottenere una singola posizione (non periodica) puoi semplicemente usare il modificatore oneFix. Esempio:
SmartLocation.with(context).location()
.oneFix()
.start(new OnLocationUpdatedListener() { ... });
Modo semplice e facile,
Ottieni la posizione utilizzando https://github.com/sachinvarma/EasyLocation .
Passaggio 1: basta chiamare
new EasyLocationInit(MainActivity.this, timeInterval, fastestTimeInterval, runAsBackgroundService);
timeInterval -> setInterval (long) (inMilliSeconds) significa - imposta l'intervallo in cui vuoi ottenere le posizioni.
fastTimeInterval -> setFastestInterval (long) (inMilliSeconds) significa - se una posizione è disponibile prima puoi ottenerla. (ovvero un'altra app utilizza i servizi di localizzazione).
runAsBackgroundService = True -> (il servizio verrà eseguito in background e si aggiorna frequentemente (in base a timeInterval e fastTimeInterval)) runAsBackgroundService = False -> (il servizio verrà distrutto dopo un corretto aggiornamento della posizione)
Passaggio 2: preparare gli abbonati EventBus: dichiarare e annotare il metodo di iscrizione, facoltativamente specificare una modalità thread:
per esempio:
@Override
public void onStart() {
super.onStart();
EventBus.getDefault().register(this);
}
@Override
public void onStop() {
super.onStop();
EventBus.getDefault().unregister(this);
}
@SuppressLint("SetTextI18n")
@Subscribe
public void getEvent(final Event event) {
if (event instanceof LocationEvent) {
if (((LocationEvent) event).location != null) {
((TextView) findViewById(R.id.tvLocation)).setText("The Latitude is "
+ ((LocationEvent) event).location.getLatitude()
+ " and the Longitude is "
+ ((LocationEvent) event).location.getLongitude());
}
}
}
È tutto.
Spero che possa aiutare qualcuno in futuro.
Aprile 2020
Passaggi completi per ottenere la posizione corrente ed evitare la nullità dell'ultima posizione nota.
Secondo la documentazione ufficiale , Last Known Location potrebbe essere Null in caso di:
In questo caso, è necessario richiedereLocationUpdates e ricevere la nuova posizione su LocationCallback .
Con i seguenti passaggi la tua ultima posizione nota non è mai nulla.
Prerequisito: libreria EasyPermission
Passaggio 1: nel file manifest aggiungere questa autorizzazione
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
Passo 2:
override fun onCreate(savedInstanceState: Bundle?) {
super.onCreate(savedInstanceState)
setContentView(R.layout.activity_main)
//Create location callback when it's ready.
createLocationCallback()
//createing location request, how mant request would be requested.
createLocationRequest()
//Build check request location setting request
buildLocationSettingsRequest()
//FusedLocationApiClient which includes location
mFusedLocationClient = LocationServices.getFusedLocationProviderClient(this)
//Location setting client
mSettingsClient = LocationServices.getSettingsClient(this)
//Check if you have ACCESS_FINE_LOCATION permission
if (!EasyPermissions.hasPermissions(
this@MainActivity,
Manifest.permission.ACCESS_FINE_LOCATION)) {
requestPermissionsRequired()
}
else{
//If you have the permission we should check location is opened or not
checkLocationIsTurnedOn()
}
}
Passaggio 3: creare le funzioni richieste da chiamare in onCreate ()
private fun requestPermissionsRequired() {
EasyPermissions.requestPermissions(
this,
getString(R.string.location_is_required_msg),
LOCATION_REQUEST,
Manifest.permission.ACCESS_FINE_LOCATION
)
}
private fun createLocationCallback() {
//Here the location will be updated, when we could access the location we got result on this callback.
mLocationCallback = object : LocationCallback() {
override fun onLocationResult(locationResult: LocationResult) {
super.onLocationResult(locationResult)
mCurrentLocation = locationResult.lastLocation
}
}
}
private fun buildLocationSettingsRequest() {
val builder = LocationSettingsRequest.Builder()
builder.addLocationRequest(mLocationRequest!!)
mLocationSettingsRequest = builder.build()
builder.setAlwaysShow(true)
}
private fun createLocationRequest() {
mLocationRequest = LocationRequest.create()
mLocationRequest!!.interval = 0
mLocationRequest!!.fastestInterval = 0
mLocationRequest!!.numUpdates = 1
mLocationRequest!!.priority = LocationRequest.PRIORITY_HIGH_ACCURACY
}
public fun checkLocationIsTurnedOn() { // Begin by checking if the device has the necessary location settings.
mSettingsClient!!.checkLocationSettings(mLocationSettingsRequest)
.addOnSuccessListener(this) {
Log.i(TAG, "All location settings are satisfied.")
startLocationUpdates()
}
.addOnFailureListener(this) { e ->
val statusCode = (e as ApiException).statusCode
when (statusCode) {
LocationSettingsStatusCodes.RESOLUTION_REQUIRED -> {
try {
val rae = e as ResolvableApiException
rae.startResolutionForResult(this@MainActivity, LOCATION_IS_OPENED_CODE)
} catch (sie: IntentSender.SendIntentException) {
}
}
LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE -> {
mRequestingLocationUpdates = false
}
}
}
}
private fun startLocationUpdates() {
mFusedLocationClient!!.requestLocationUpdates(
mLocationRequest,
mLocationCallback, null
)
}
Step 4:
Gestire i callback in onActivityResult () dopo aver verificato che la posizione sia aperta o che l'utente accetti di aprirla.
override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
super.onActivityResult(requestCode, resultCode, data)
when (requestCode) {
LOCATION_IS_OPENED_CODE -> {
if (resultCode == AppCompatActivity.RESULT_OK) {
Log.d(TAG, "Location result is OK")
} else {
activity?.finish()
}
}
}
Passaggio 5: ottieni l'ultima posizione nota da FusedClientApi
override fun onMapReady(map: GoogleMap) {
mMap = map
mFusedLocationClient.lastLocation.addOnSuccessListener {
if(it!=null){
locateUserInMap(it)
}
}
}
private fun locateUserInMap(location: Location) {
showLocationSafetyInformation()
if(mMap!=null){
val currentLocation = LatLng(location.latitude,location.longitude )
addMarker(currentLocation)
}
}
private fun addMarker(currentLocation: LatLng) {
val cameraUpdate = CameraUpdateFactory.newLatLng(currentLocation)
mMap?.clear()
mMap?.addMarker(
MarkerOptions().position(currentLocation)
.title("Current Location")
)
mMap?.moveCamera(cameraUpdate)
mMap?.animateCamera(cameraUpdate)
mMap?.setMinZoomPreference(14.0f);
}
Spero che questo possa aiutare.
Happy Coding 🤓